@article {50021,
	title = {oil sands development contributes elements toxic at low concentrations to the Athabasca River and its tributaries},
	volume = {Early Edition},
	year = {2010},
	publisher = {Proceedings of the National Academy of Sciences},
	url = {http://www.pnas.org/content/early/2010/08/24/1008754107.full.pdf},
	author = {Kelly, Erin N. and Schindler, David W. and Hodson, Peter V. and Short, Jeffrey W. and Radmanovich, Roseanna and Nielsen, Charlene C.}
}
